Heemann boemann



* STATES UNITE ATENT Fries.

HERMANN BOB-MANN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TOJ. WVALTER DOUGLASS, OF SAME PLACE.

ELLIPSOGRAPH.

SPECIFICATION forming part of Letters Patent No. 383,696, dated May 29,1888.

Application filed July 28, 1887.

To all whom, it may concern:

Be it known that I, HERMANN BORMANN, a subject of the Emperor ofGermany, residing at the city of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have in vented certain new anduseful Improvements in Ellipsographs, of which the following is aspecification.

My invention relates to certain novel features in the construction andoperation of ellipsographs or mathematical instruments for draftingpurposes.

The principal object of my invention is to provide a device for drawingellipses, ovals,and other figures; and to which ends my inventionconsists of an instrument or instruments arranged and operatingsubstantially in the manner illustrated in the accompanying drawings,which represent forms thereof found in practice efficient, and inwhich-- Figure 1 is an elevation of a device of my improved constructionfor drawing elliptical figures. Fig. 2 is a transverse section on theline a u of Fig. 1. Fig. 3 is a plan view of the elliptical plate,looking from the under side thereof, and showing the means for attachingsaid plate to the feathered rod of the device. Fig. 4 is an elevation ofan ellipsograph of my improved construction embracing certainmodifications in the parts thereof. Fig. 5 is a cross-section on theline i) o of Fig. 4. Fig. 6 is a top view of the elliptical-shaped platefor attachment-to the feathered rod of the device. Fig. 7 is across-section of the spring-leg of the device on the line 20 w of Fig.4. Fig. 8 is a similar view on the line w m of Fig. 4, and Fig.9 is alongitudinal vertical section through the pencil attachment.

Similar letters of reference indicate like parts in the several views ofthe drawings.

Referring to the drawings for a further de scription of my invention, arepresents a vertical rod of suitable form, made of steel, brass, orother material, and having a feather ex tending either the entire oronly a portion of the length of the rod, and carrying on its upperextremity a milled thumb-nut, a, made of brass, German silver, or othermaterial.

Loosely carried on the rod a is a sleeve, 1), and integral therewith onthe upper extremity thereof is a milled-edge button or cap, 11.

Serial No. 245.481. (No model.)

This sleeve 1) is held to place on the rod a by means of upper and lowerhubs, c and c, suitably attached to the rod a, whereby the free rotarymovement of the sleeve 1) by hand may be permitted in anywell-understood manner.

To the lower extremity of the rod a is fitted a collar, (1, by means ofa set-screw, d, into which collar is fitted one or more needle-points,

e. The elliptical or other form of plate f carries a hub, g,which isrigidly secured thereto, and passing through this plate f and fastenedto the hub g by means of a screw, h, is a flatsurfaeed spring, h, madeof steel or other suitable metal, curved slightly on both sides from thecenter,with the ends thereof slightly bent upward, as shown in Fig. 1;or this spring may be of any other form for holding the platef, with itshub g, in any desired location on the feathered rod a, and which may bereadily moved up and down thereon by hand for varying the dimensions ofthe figure to be drawn upon the paper or other material.

To the sleeve 1) is attached, by means of screws i or otherwise, aspringing leg, It, made of steelor other metal, the upper portion ofwhich is constructed preferablyin the form of an inverted U, throughwhich a screw, j, is inserted for adjusting the lower portion of the leg70 to any desired angle of inclination for accommodating whatever sizeplate or disk may be fitted onto the feathered rod a. The inverted-Uportionj of the leg is is preferably eonstructed so that the upper armof the U portion of.the leg will contain a greater thickness of metalthan the lower one-that is to say, will taper off slightly from thecurve of the U in the direction of the sleeve band by turning the screwjthe leg can be readily set to the desired angle of inclination for acocommodating different sizes of plates or disks f that may be fitted ontothe feathered roda. From the extremity of the lower arm of the U to theprojection 9' the metal is tapered in any suitable manner, forming asecondary spring, j, for holding the leg is at all times snugly upagainst the periphery of the elliptical plate or disk f. The projection9' formed in the leg 70, is held to place and against lateral movementin a double guideway, 1, se- :00 cured rigidly to the sleeve b, therebyinsuring the proper amount of rigidity to the spring ing leg is whilethe instrument is being manipulated by the draftsman.

The spring-leg k is preferably constructed V-shaped, and to this leg bya knuckle-joint at Z is attached a short leg, is, the sides of which arealso beveled off, and integral with this leg k is a tube, Z having anarrow slit extending through the surface thereof. Through the tube Z isinserted the shank m of the pencil attachment M, which carries a pin, m,in its surface. The upper portion of the shank m is preferablyconstructed of less diameter than the lower portion, and around theupper portion, m, is coiled a spiral spring, m, the upper extremity ofwhich rests snugly up against a bracket, a, secured by means of screws nto the flat surface of the spring-leg 7c, and this bracket 12 has a slotin its free extremity,

. through which the upper portion of the shank cil attachment M has athreaded surface, and

this shank is bored out to receive the pencil m, and to which isattached a cap, m of any ordinary well known construction, with athreaded surface barrel which meshes with the threaded surface of theshank, for holding the pencil m when it is secured to place firmly inthe barrel of the shank m,- or, instead of the pencil attachment shownin Fig. 1, a pen attachment of any well-known construction or any otherform of pencil attachment may likewise be used with but slightmodifications.

In Fig. 4 is shown a modified form of my improved device, in which a isa feathered rod carrying a thumb-nut, a, on its upper extremity, and towhich rod is similarly attached a sleeve, 1), having a milled-edgebutton, b, on its upper extremity,'and this sleeve is held to place bymeans of upper and lower hubs, c

and c.- The lower extremity of the rod a is grooved out slightly,forming recesses for the reception of the shouldered needle-points e,which are held firmly in position therein by means of a collar, d,slipped around them. The elliptical or other desired form of plate f,carrying a hub, g, rigidly secured thereto, is fitted to the featheredrod a and held to place thereon by means of the set-screw 9.

By means of screws i is secured to the sleeve b the spring-leg is, madeof steel or other suitable metal. This leg in order to insure the properspringing action is filed out in a suitable manner to form a spring atand aprojection, j, formed beyond this spring,as shown in Fig. 4,through which an adjusting-screw, j, is inserted to permit the springingleg is to be set by hand,through the action of thescrew j,to the properangle of inclination to accommodate any desired size of plate f, whichmay be readily and quickly fitted onto the feathered rod or by simplyremoving the collar d, holding the needle-points in position. On theopposite side of the projection j is formed-a secondary spring, j, forholding the springleg it up snugly against the periphery of the plate ordisk f while the instrument is being manipulated by the draftsman.

The lower portion of the spring-leg k is preferably beveled off on thesides, and by a knuckle-joint at Z is attached a short leg, k, which hasintegral therewith a tube, Z having a narrow slit extending through thesurface thereof. Through this tube Z is inserted the shank m of thedrawing-pen attachment M, provided with a pin, m, for holding the penattachmentin proper position for use; or, when the pen is filled withink and it is desired to raise the pen out of contact with the paper forany purpose whatsoever, the pen attachment may be readily raised by handand the shank m, carrying the pin m, moved upward sufficiently to allowthe pin to rest snugly against the upper extremity of the tube Z by aslight turn by hand of the pen attachment in the tube to the right orleft of the slot. This pen attachment M consists of two steel blades, 1)and p, bent so that when the points nearly touch each other there willbe a space above the points for holding the ink, and these two blades 19and p are drawn together or released from each other by means of aregulating-screw, 19 extending through the middle thereof. One of thesteel blades works upon a joint, 19 at its upper end, so that the inkcan be thoroughly cleaned off the inner surface of the respective bladeswhen it is desired to put them away, and to obviate their becominginjured by rust; or, instead of the pen attachment, any suitableconstruction of pencil attachment may be used.

To-the outside of the spring-leg k is secured by means of screws 1' aflat spring, 1*, formed into any desired shape, and this spring restsagainst the upper extremity of the shank m of the pen attachment M, forfirmly holding this; shank in proper position in the tube Z forimmediate use.

The manner of manipulating my improved drafting device for makinggeometrical figures may be briefly explained in the following manner:The device being in the positionsjin- 'dicated in either Fig. 1 or 4, bysimply placing the first finger of one hand upon the milled nut a of thefeathered rod a, with the needlepoints e impinging against the paper toinsure its true vertical position, by placing the thumb and first fingerof the other hand against the milled edge of the button I) of the sleeve1), the spring-leg 76, secured to the sleeve, may be readily revolvedaround the periphery of the elliptical or other shaped plate f, suitablysecured to the feathered rod a, thereby causing the desired form ofgeometrical figure in pencil or ink to be made upon the paper, andby themere movement of the plate or disk f on the feathered rod a thedimensions of the figure may be readily increased or diminished by thedraftsman.

Having thus described the nature and objects of my invention, what Iclaim as new, and desire to secure by Letters Patent, is

' 1. An improved ellipsograph havinga feath IIO ered rod with anadjustable collar on its lower extremity, to which are fitted two ormore shouldered needlepoints, a plate with a hub mounted on said rod, aspring secured to said hub and extending through said plate for bold ingthe same in any position vertically on said rod, a sleeve mounted on theupper portion of 'said rod, a springleg suitably secured to said holdingthe same in a vertical position thereon,

a sleet e provided withupper and lower hubs suitably mounted on theupper portion of said rod, whereby a rotary movement thereof isobtained, a spring-leg secured to said sleeve, a short leg hinged tosaid spring-leg, and a pen or pencil attachment held in position by saidshort leg and supported by said springlcg, substantially as and for thepurposes set forth.

3. An ellipsograph having a feathered rod with a sleeve mounted upon theupper portion thereof, one or more shouldered needlepoints suitablyattached to thelower extremity of'said rod, a plate fitted to saidfeathered rod, and means for retaining it in position thereon, incombination with a spring-leg attachcd to said sleeve provided with anadjustingscrcw, a short leg which hasintegral therewith a tube hinged tosaid springleg, and a pen or pencil attachment supported in posi tion bysaid legs, substantially as and for the purposes set forth.

4:. An improved cllipsograph having a feathered rod with a nut on itsupper extremity formed integral with said rod, and two or moreshouldered needle-points secured to a collar adj ustably attached to thelower extremity of said feathered rod, :1. disk with a narrow grooveformed in the interior surface thereof, a spring for retaining saiddevice in a vertical position on said rod, asleeve mounted on the upperportion of said rod, a spring-leg figure to be drawn may be readilyincreased or diminished, and a sleeve journaled to said rod, incombination with a spring-leg with its adjustingscrew, a short leghinged to said springleg, a drawing attachment supported by said legs,and a double guideway rigidly secured to said sleeve, whereby thelateral movement of the legs while the instrument is being manipulatedis prevented,substantially as described.

6. An ellipsograph having a rod with a thumb nut on its upper extremityand recesses formed in its lower extremity for the reception ofshouldered needle-points held therein by a collar with a clamping screw,an elliptical plate or disk combined with a hub fitting onto said rod,and a spring for holding it in position thereon, in combination with asleeve suitably supported upon said rod, a spring-leg attached to saidsleeve, with a screw for adjusting said spring-leg to the desired angleofinclination to said rod, a short leg hinged to said spring-leg andhaving formed therewith a tube with a slit running through the surfacethereof, a pen or pencil attachment, the stem of which-carries a pin, ahelical spring coiled around said stem, and a bracket secured to saidspring-leg, all arranged substantially as and for the purposes setforth. 7 v

7. An improved device for forming geometrical figures, having afeathered rod, a plate or disk with a hub mounted on said rod, a springfor holding said plate or disk and hub in position thereon, a sleevemounted on the upper portion of said feathered rod, a spring-legattached thereto and to a short leg having a tube with a vertical slitin the surface thereof, a drawing attachment with a stem having a pinsecured thereto, and means, as described,

for supporting said attachment in proper position while the instrumentis being manipulated, substantially as described.

8. An improved device for forming geometrical figures, having afeathered rod and a sleeve supported in position thereon, a buttonattached to said sleeve, a guideway secured to said sleeve, a spring-legsecured to said sleeve and provided with an adjustingscrew, a tubeformed integral with a short leg hinged to said spring-leg, and adrawing attachment supported in said short leg and guided by saidspring-leg, substantially in the manner and for the purposes described.

In witness whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

HERMANN BORMANN,

Witnesses:

ANDREW ZANE, J12, THOMAS M. SMITH.

